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Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition

✍ Scribed by Xavier Solans; M. Teresa Calvet; M. Luisa Martı́nez-Sarrión; Lourdes Mestres; Aniss Bakkali; Eduardo Bocanegra; Jorge Mata; Marta Herraiz

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
204 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

Results of a detailed X-ray di4raction and thermal analysis study of the structural phase transitions in LiKSO 4 carried out in the temperature range 123+1000 K are presented. The study indicates 5ve phase transitions in the temperature range studied at 937, 707, 226 (268), 200 (251), and 186 (190) K (values in parentheses are for a warming process). The transition at 226 (268) K is reported for the 5rst time. The di4erent phases (from high to low temperature) show the space groups P6 3 /mmc, P2 1 cn, P6 3 , P6 3 mc, P3 1 c, and Cmc2 1 . The working conditions allowed us to obtain the di4erent phases without twin crystals and without mixtures of several phases. We were thus able to determine the crystal structures of the di4erent phases with more accuracy. The transitions at high temperature produce large variations in the crystal structure and the enthalpy of process is high, while at low temperature, as the structure is more compact, an activation energy is necessary, and the transitions show a thermal hysteresis, while the structural variation is as small as the enthalpy of the process.

📜 SIMILAR VOLUMES

Comment on “Thermal Analysis and X-Ray D
Comment on “Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition”
✍ Xavier Solans; M. Teresa Calvet; M. Luisa Martı́nez-Sarrión; Lourdes 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 84 KB

In the preceding manuscript, Tomaszewski comments on our previous paper, X. Solans et al., J. Solid State Chem. 148, 316 (1999). These comments can be summarized in two points: (a) The in6uence of the domain or/and twinning on the obtained results and (b) the poor data obtained in the mentioned pape

Comment on “Thermal Analysis and X-Ray D
Comment on “Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition”
✍ Paweł E. Tomaszewski 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 82 KB

In a recent paper (J. Solid State Chem. 148, 316 (1999)) Solans et al. presented the structure of di4erent phases of LiKSO 4 and a new phase transition at about 226 K (268 K on heating). We believe that most of the results commented on are not credible.

X-Ray Diffraction, Thermal and Spectrosc
X-Ray Diffraction, Thermal and Spectroscopic Studies on 2,4-Dinitrodiphenylamine (DNDPA)
✍ R. M. Roy; K. V. Prabhakaran; E. M. Kurian 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 126 KB 👁 2 views

2,4-Dinitrodiphenylamine (DNDPA) has been studied as regards its crystal structure and thermal decomposition characteristics using Xray diffraction (XRD), simultaneous thermal analysis, ultraviolet and visible spectroscopy, infrared spectroscopy, hot-stage microscopy and high performance liquid chro